Do you know what sentient means? Our current understanding is that almost all animals are sentient, including insects.
dude the list of sentient life is nearly all of it by mass, do you mean sapient life?
Give them a break, guys. The word "sentient" was used as though it were a stand-in for "sapient" for a very long time. It's better to be instructive and positive than dismissive or talking down.
Also, Mind of Tempest, the vast majority of living biomass is
plant matter, which I don't think anyone argues is sentient. Animal life only makes up less than 0.3% of all life by mass, and of it, the vast majority are marine arthropods, terrestrial arthropods, or annelids, beings that are
at the very least of debatable sentience.
Any alien species could easily have their own equally arbitrary definition that granted them a personhood but denied it to humans. For example illithids might define things that lack capability to form a telepathic hivemind to be lesser creatures.
Sure. I find most of these arguments painfully tedious. The distinction is quite clear: Does the class of entity (species, computer program, crystalline structure, whatever) usually have the capacity to ask questions of the form, "Does X being have moral worth?"? If so, congratulations, members of that species are moral persons. If you have even the
suspicion that they might be able to ask such questions, you should presume that that being is a moral person unless and until you can prove otherwise. Dogs are not moral persons, though that does not excuse treating them (or any other non-sapient animal) poorly. An incapacitated, sleeping, injured, ill, or developmentally-challenged human is not stripped of this status solely for any of those reasons.
Or, if you prefer, we can use The Words from Star Control II: "Hold! Why do you do this! What you are doing is wrong!"